Astrophysics

Object Moving Towards the Observer Might Appear to Have Infinite Velocity and Hit Without Giving Any Warning.

The apparent velocity of an object moving towards or away from the observer will be different from its actual velocity. To get the apparent velocity, actual velocity will have to be multiplied by a factor called scale factor. For an object moving away from an observer at considerable speed compared to that of light, scale factor is given by1/1+z, where z = v/c, v= velocity of the moving object and c = velocity of light in vacuum. So, apparent velocity = Actual velocity/(1+z).But when the object is moving towards an observer, it appears to move faster than actual velocity. This is because Scale factor for objects approaching the observer=1/ (1-z). Most important thing is that the velocity of the object appears to be faster than the velocity of light in vacuum, for all values of z > 0.5.Also, it appears to be approaching at infinite speed for z =1.

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